Paper tube and method of making the same.



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PAPER TUBE AND METHOD OF MAKING THE SAME.

APPLIOATI ON IILED JULY 11, 1912.

Patented Oct. 7, 1913.

ran snares T ATENT @FFTQEO cnannns suntan, or warronn, mnssncnusn'r'rs.

rerun TUBE Ann METHOD or MAKING THE SAME.

Lamaze.

Specification of Letters Eatent.

Patented @ct. i, 1913.

Application filed July 11, 1812. $6i1ll Not 798,$ &-

Tubes and Methods of Making the Same, of A which the following is a specification.

My present invention pertains to an improved paper tube and the method of making the same.

The invention, in so far as it is susceptible of being illustrated, is shown in the annexed drawings, wherein:

Figure 1 is a perspective view of the blank from which the tube is formed; and Fig. 2 a similar view of the tube.

Tn the production of paper tubes (especially tubes which are adapted for use in the manufacture of shells) it is desirable and sometimes necessary that the tube shall be of auniform diameter throughout, shall present a smooth and even surface, that the surface shall be waterproof, and also, in order to make a salable and attractive article, that the color shall appear the same, or substantially the same, over the entire outer surface or face of the tube.

The object of the presentinvention is to produce such a tube, and by employing't-he method hereinafter set forth such object is accomplished;

' The blank from which the tube is formed is shown in Fig. 1, and comprises a sheet of paper which, of course, is more or less absorptive, the main portion thereof being designated by 1, and the remainder by 2, the latter being colored. The edges of the sheet, as at 3 and 4, will preferably be thinned, or tapered to a thin or feather edge, so that, when the sheet is rolled into tubular form, it will not present any perceptible thickened portion, nor an sharp edge upon its interior or exterior-w ere the edges of the sheet terminate. pleted tube is shown in Fig. 12, wherein 1 designates the body; of the blank which forms the main portion of the tube. The outer colored surface is designated in said figure by 2, but owing to the-fact that the edges 3 and 4. are thin and merge into the tube, it is impossible to show the same in the completed tube. .This sheet may be made in accordance with Letters Patent of the nited States numbered 696,131,

The comgranted to me under date of March 25,

1902, the main difierence between the-sheet shown in said patent and that disclosed in the present application residing in the fact that in the present instance the edges of the sheet are thinned, a above noted.

to be more or less rough or broken when closely examined, as is the case with all uncalendered paper, and such surface will not, when treated with a waterproofing material, present an even color, but on the other hand, will appear mottled and blotchy thereby producing an undesirable article. To prevent this, and to insure the production of a finished article, the surface of which will present an even color, I subject the surface of the paper to a substance or compound which tends to fill the unevenness in the surface and prevents the waterproofing material from producing a mottled effect. The entire surface may be so treated, or the plain or uncolored surface or the colored surface alone subjected to ,such treatment.

The compound preferably employed comprises a mlxture of glue and clay, preferably china clay. Any substance having the property of china clay may, however, be employed in lieu thereof. Thus, for instance, asbestos ground to the fineness of china clay may be employed as a filler, and in so far as the generic invention is concerned it is to be understood that any material capable of acting in the same manner as china clay is to be regarded as the equivalent thereof. China clay, or its equivalent, which is .used as a filler, is inert in that it is unafiected by the material employed to make the tube waterproof, and is likewise inert in that it does not directly affect the color, or the coloring matter which is employed.

In the practice of the invention it is usual to apply the compound or mixture to the colored section alone, and after the sheet The surface of the paper will be foundis formed into a tube the outer surface thereof is burnished. This operation tends to set down any upstanding fibers and to smooth out the unevenness of the clay. The .tube thus formed is dipped'in p rafin or other suitable waterproofing material, it being understood that in the commercial practics of the invention a number of such tubes are simultaneously \treated. Anyfs'lirp'lus fact remains-that without the use of the clay I being covered with clay, might be at once or other substance which, for want of a better term, maybe denominated an inert filler, the tube would present a mottled or unevenly-colored surface. It is conceivable, of course, that the colored. surface 2, after bugnished before the sheet is formed into a tu e.

When speaking of the surface'of the paper or sheet as being more or less broken or rough, it is, of course, to be understood that the paper employed is not produced from the expensive stock, though the paper should be strong. Stated in another way, the surface may be said to present a series of uneven depressions and ridges, as will appear to a greater or less extent upon thesurface of any paper when examined under a glass. The use 9f the filler or clay tends to fill up such depressions and, as above set forth,

' prevents the waterproofing material from producing a mottled eifect upon the surface.

It is to be understood that, in so far as the generic invention is concerned, a paper without any colored section may be em: ployed, and, furthermore, that if a color other than that which would naturally be 40 D -brought,about by the use of colored clay. Again, it will be understood that the tube produced by the paper is desired, it may be may be colored after the sheet is brought into tubular form.

Having thus described my invention, what I claim is: 1. The method of making waterproof paper tubes, which consists in treating a sheet of "paper with an inert filler applied to one face thereof; bringing the sheet into tubular form with said treat-edface outermost; and finally waterproofing the same.

2. The method of making waterproof paper tubes, which consists in treatin a sheet of paper with an inert filler applie to one face thereof; bringing the sheet into tu-.- I bular form with said treated face outermost; burnishing it; and finallywaterproof- I inglthesame.

section of a sheet of paper; filling one face I of such colored section With an inert filling;

bringing the sheetinto tubular form with the filled face outermost; burnishing the same, and finally waterproofing the tube.

4. The method of making waterproof.

paper tubes, which consists in producing a colored strip along one side of a sheet of paper; treating such portion with an inert filler to produce a filled face or surface; formingthe sheet into a tube with the filled face outermost; burnishing the same; and finally waterproofing the tube.

5. The method of making waterproof paper tubes, which consists in producing a colored strip along one side of a sheet of paper; treating such portion with a surface filler composed of clay and glue; rolling the sheetinto tubular form with the treated face outermost; burnishing the outer face of the tube; and finally waterproofing the same. v

- 6. The method of forming paper tubes, which consists in applying an inert filler to the outer face of a tube; and finally subjecting the tube thus treated to a. bath of waterproofing material.

7. The method :.of making waterproof paper tubes, which consists in producing a colored strip along one side of a sheet of paper; treating such colored portion with an inert surface filler; wrapping the sheet into tubular form with thetreated face outermost; dipping the tube into a bath of melted waterproofing material; and finally subjecting the tube to heat to remove the ex cess waterproofing material.

8. As a new article of manufacture, a tube formed from a sheet of paper, the outer surface of the tube being colored and said surface being filled with an inert substance, and being waterproof, the tube being distinguishable by being of an even color over its entire outer surface. p 9. As a new article of manufacture, a paper tube having an inert filler applied to and filling the outer surface thereof, such surface being waterproof, the tube being distinguishable by being of an even color over its outer surface. f

In, testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES S; BIRD. Witnesses:

WALTER M. PAINE,

ELMER H. BARTLETT. 

